With V2 tune multiple cylinders misfiring cyl-1 and cyl-6, I replaced the stock spark plugs with NGK 2 step colder plugs (97506) gapped to 0.020" and the WMI nozzle is changed from snow performance V1 625CC/min to AEM 1000CC/min nozzle. Now the car feels more responsive to throttle and pulls harder with V3 tune.